The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 2025
Filed:
Mar. 07, 2023
Applicant:
Kioxia Corporation, Tokyo, JP;
Inventor:
Mutsumi Okajima, Yokkaichi Mie, JP;
Assignee:
KIOXIA CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H10B 12/00 (2023.01); G11C 5/10 (2006.01);
U.S. Cl.
CPC ...
H10B 12/312 (2023.02); G11C 5/10 (2013.01);
Abstract
A semiconductor memory device includes: a memory cell array including memory cells, each including an oxide semiconductor transistor; a first insulating layer disposed above the memory cell array; a first wiring layer disposed between the memory cell array and the first insulating layer; a second insulating layer extending in a vertical direction. The second insulating layer has an annular cross-section. The semiconductor memory device includes a third insulating layer further disposed over the first insulating layer, a portion of the third insulating layer being surrounded by the second insulating layer.